chore(deps): update syn requirement from 1.0.109 to 2.0.43

Updates the requirements on [syn](https://github.com/dtolnay/syn) to permit the latest version.
- [Release notes](https://github.com/dtolnay/syn/releases)
- [Commits](dtolnay/syn@1.0.109...2.0.43)

---
updated-dependencies:
- dependency-name: syn
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>

eventually-macros/Cargo.toml

@@ -7,6 +7,6 @@ edition = "2021"
 proc-macro = true
 
 [dependencies]
-syn = { version = "1.0.109", features = ["full"] }
+syn = { version = "2.0.43", features = ["full"] }
 quote = "1.0.33"
 eventually = { path = "../eventually" }